Box-staying machine



C. F. WALZ AND F. D. MORRIS.

BOX STAYING MACHINE.

APPLICATION FILED iuLY 28.1919.

3,346,573. Patent-ed July 13, 1920.

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oniTEn sTATEs PATENT oFFlcE.

CHARLES FREDERICK EVALZ ANID FRANCIS DEVELIN MORRIS. OF PHILADELPHIA,

PENNSYLVANIA, ASSIGNORS, IT? MESNE ASSIGNMENTS, TO EDWIN WOLF, BEN- JAMIN WOLF, CLARENCE "ljiiiill, LOUIS EOLF, AND WOLF, ALL OF PHILA- DELPHIA, PENNSYLVANIA, COPARTNERS TRADING AS NATIONAL METAL EDGE BOX. COMPANY, OF PIIILADELPEIA, PENNSYLVANIA.

BoX-sTarINe MACHINE.

Application inea muy z8,-

L had to the accompanying drawings, which forni a part of this specification.

The invention relates to that class of machines in which a die is caused to descend upon a stationary anvil, between which is placed a box yand stay or other articles to be clamped together' or compressed.

I In box staying machines, such as described in connection with my invention, the anvil is usually of rectangular cross section and positioned diamond-wise, with its horizontal active edge uppermost. Against this edge and contiguous surfaces the die descends and does its work.

The invention may, however, be applied with equal effectiveness to machines in which anvil and die present round or flat horizontal surfaces between which the compression takes place.

In the operation, for example, of staying i0 a box angle,'the operator places the two sides to form said angle upon the faces of the anvil contiguous to the active edge. and holds them close with his lingers during the action of the die inthe application of the i5 stay. This requires that the operator shall keep his ngers close to the joint and yet not too close. To decrease danger of accident and protect the operator, it is desirable to provide some safetlvdevice therefor.

10 The object of this invention is to provide such a safety device, wherein appropriate parts are supplied, carried by the die-holder and projecting downwardly in advance of the die. and so positioned. as to contact with 5 the operators fingers if he has inadvertently placed them within the danger zone, and thereby be so moved relatively to the die as to disrupt the driving connections to the die-holder so that the latter will cease to 0 be positively moved downward.

This object has heretofore been attained by means that would come within the broad Specification of Letters Patent.

1919. Serial No. 313,761.

language of the foregoing description; but vthe safety devices of the prior art have been so complicated as to frequently get out of order and hence their action has been uncertain 'and unreliable. The more specific object of this invention is to so simplify the safety mechanism actuable by the finger guard as to materially reduce the likelihood of the parts getting out of order and, inall circumstances, to insure safety to the operator. e

preferred embodiment of the invention is shown in the drawings, in which- Figure lis a side elevation of a part of abox staying machine with the invention applied thereto.

Fig. 2 is a plan view, partly in section, of

. the die-holder and guide therefor.

Fig. 3 is an end view of the die, anvil and l`.linger guard.

@ver the anvil a is a die Z) carried by a vertically reciprocatory die-holder c. A metal staying strip (not shown) is fed from a roll, by appropriate mechanism, over the anvil a and under the die b. This mechanism is well known andV forms no part of the invention and is therefore not shown. The box or boX blank to be reinforced is placed on the anvil, and the die, in its descent, applies the staying strip to the box angle.

Pivoted on the machine frame is a lever d. The swinging end of the lever is connected to the die-holder c by means of a link A connecting rod g is reciprocated up and down by means of actuating mechanism `which is usual in this class of machines rand is therefore not illustrated. The upper end of the connecting rod g is connected with the joint between lever (Z and link e by a link 7".

This die-actuating mechanism is old and common except that it is customary to make the lever d and link f as a single or unitary elbow lever. Hence the upper end of the connecting rod g, in its up and down move- Patented July 13, 1920. y

ment, swings always on the axis of lever d,

desired shall have normally the same mode of operation, provision is made for so locking thelever (Z to the link that they normally move as a niiit. Provision,however, is made forunlocking thev lever d from the link so that the linkf, as the connecting rodg movesdownward, is free to swing, on the end thereof that is pivoted to the toggle joint, independently of the lever (l and tlicrefore without forcibly depressing the die (i.

A preferred form of releasable lock is 'the bell-crank lever h, pivoted on the. link 7.

, Onearin 7L Vof this locking lever has hook adapted to engage a corner of an arm f integral with the Ylever (L Itis obvious that,

as the connectingrod g Vmoves down, the

Vtivelyswings up the lever d, causing the,

toggle joint to operate, inthe usual manner, to retract the die l). Y 'A From the foregoing description it is clear that if, in the downward movement of the iod g, the locking lever is independently actuated to cause its hooked arm L- to swing out of engagementwith the aim 71: of lever Y same Vat 'bothcnds support-ed Vclose to the working cdgeof the (l, theV die Z1 will not be positively moved down. The disengagement of the locking lever is effected automatically, in case there Y is any obstruction (for example, an operators finger) to the downward movement of the dieby the following mechanism.

Afinger guard, of light frame construction,comprising yoke-shaped endpieces n, '12 is carried by the die-holder, straddling the Connecting the end pieces are horizontally extending guarding rods o, 0, onV both. sides of the die and.

slightlyA in advance thereof. These rods are die, not close enough to interfere Ywith the normal iwi-king` of the machine, but sufli-v cientlyV close toV surely contact Vwith Vthe operators fingers if they should be in dan- .gerous position. Y This linger guaii'd is a.

known contrivance. Y lit is normally inoperative in that it moves up and down with the die L; but it is slidable vertically i'ipwaid and so operates when, in itszdownward movement, it encounters an operators linger or any other obstriuztion. A To insure that it shall move upward in a right line, a bar 79 connects the en d pieces a, fa. Back of connecting bar y?, thedie-.liolder carries two" .intermediately pivoted levers, r, The arb jacent ends of these levers r have a pin and slot connection s. The opposite ends lof the levers are slotted to engagepins t, t on the bar p. :lf either endofthe finger guard has level as vthe end which meets anobst/ructioirl Therefore, one endof the finger guard cannot be tilted relatively tov the other.

Assuming that,'1n the pressing movement 1 of thedie, the downward movement of the linger guard is arrested, and hence moved up relatively to the die, a knockfoil' rod a, Vcarried.bythe finger guard, engages the larm z' of the locking lever and swings the'arm 71, of the locking lever out of engagement with the arm 7c of the lever d, sothat the lever (Z Vis no longer forcibly pulleddown. Therefore there is no Vpositive downwardpushV lupon the die-holder and if itshould move down farther by gravity and momentum, it might dono serious injury. 'Howeveu itis deemed desirable -to positively stop the downward movement of the die. This may be effected in different ways. VIn Fig; 2, a ratchetV 1G is secured to the/machine' frame. A lever, pivotally carried by the lever k, has one arm 13 adapted to act as a pawl lengageable with the ratchet 12 and anothei' arm 14 in line of movement of a knock-olf rod 15 carried by the finger guard. Assuming that the linger guard meets an obstruction in its downward movement, the vfirst action is yfor knock-off-rcd u toV engage the arm il and disrupt the driving connection betweenlink 7 and lever (l, as before described.A v Immediately after this, knock-olf rod 15 engages the arm 111 and swings the pawl 18 intoY engagement with ratchet 16, `thereby arresting the downward movement of lever Z and die-holder' ci In the normal operation of the 'machine the linger guard is always retracted relatively to the die a short distance before the ldie completes itsdownward movement, but l at this timethe arms z' and 14- have moved so far toward the vertical center line of the die that the knock-olf rods u and 15 slide back of the heels of said arms and do not actuate them. Y

A pin 'g/ on the connecting rod ilf/ is adapted to engage a tail piece .e onV the locking lever, therebyinsuring the engagement of the locking lever with the arm V/v-of the lever at the end of the up-sti'oke of the connectingV rod g. As the connecting rod moves down, the pin ,i/ recedes Afrom the tail piece e, allowing the locking lever to swing into unlocking position if it is engaged by the lknock-'olf rod u. A stop'10 ontlie link f limits the extent of the swingof the locking lever in its unlockingymovement. Y

The upward movement of the lever CZ and arm k is limited by a spring-pressed stop 11,r thereby insuringV that the arm 7c shall not`be carried upso far asto prevent the locking lever from latching.

' Y Having now fully described our inveniso tion, what we claim and desire to protect by Letters Patent is l. in saiety stops for machinery, the

combination with a inciprocable member the4 positive operation of which it is desired to automatically arrest, a toggle `joint connec` tion between a fixed point and said member, and reciprocatory drivii'ig mechanism, of a dislilaceable device acting when in operative position to form an actuating connection between the driving mechanism and the toggle joint, a guard normally moving with said member but retractable relatively thereto upon meeting an obstruction, and means, actuable by said guard when so retracted, to move the displaceable device into inoperative position.

2. In safety stops for machinery, the combination with a reciprocable member the positive operation of which it is desired to aut m1atically arrest, a pivoted lever, a link connecting the lever and said member, and reciprocatory driving mechanism, of means to lock said driving mechanism to said lever, a guard normally moving` with said member but retractable relatively thereto upon meeting an obstruction, and means, actuable by said guard when so retracted, to actuate the locking means to disrupt the driving connection between said driving mechanism and lever.

3. In safety stops for machinery, the combination with a reciprocable member the positive operation of which it is desired to automatically arrest, a pivoted lever, and a connection between said member and lever, of a reciprocable link, a pivoted lever adapted to connect said link and the first lever so that the two move in unison to effect the advance movement of said member, a guard normally moving with said member but retractable relatively thereto upon meeting an obstruction, and means, actuable by said guard when so retracted, to swing the second lever out of connecting position, thereby allowing the movement of the link to be completed without moving the first lever and therefore without positively moving said member to complete its advance movement.

4i. ln safety stops for machinery, the combination with a reciprocable member the positive operation of which it is desired to automatically arrest, a pivoted lever and a link pivotally connected with said member, of a second link, said links' and lever beingpivotally connected, reciprocatory driving means connected with the second link, a locking lever pivoted on the second link and normally movable into position to connect the second link with the first lever, a guard normally movable with said member but retractable relatively thereto upon meeting an obstruction, and means, actuable by said guard when so retracted, to swing the locking lever into position to discon neet the second link from the first lever.

5. ln safety stops for machinery, the combination with a reciprocable member the positive operation of wliicn it is desired to automatically arrest, a pivoted lever, a connectionbetween said member and lever, and recipr icatory driving mechanism, of a two armedV lever lii-votally carried by said reciprof'atory dri ving mechanism, a hook on one arm adapted toswing into driving engagement with the first lever, a guard normally moving fwith said member but retractable relatively thereto upon meeting` an obstruc tion, and a knock-oit bar carried by said guard and adapted, when the guard is'so retracted, to engage the second arm of the two armed lever and swing the hooked arm out of driving engagement with the first lever.

6. In safety stops for machinery, the combination with a reciprocable member the positive operation of which it is desired to automatically arrest, a pivoted lever, and a connection between said. member and lever, of a reciprocable link, a pivoted lever adapted to connect said link and the first lever so that the two move in unison to effect the advance movement of' said member, a guard normally moving with said member but retractable relatively thereto upon meeting an obstruction, means, actuable by said guard L.when so retracted, to swing the second lever out of connecting position and allow the movement of the link to be completed without moving the first lever, means to reciprocate the link, and a device carried by said means and operable, in the return move ment of the link, to restore the second lever to its connecting` position.

7. lnsafety stops for machinery, the combination with a reciprocable member the positive operation of' which it is desired to automatically arrest. a pivoted lever, and a connection between said member and lever, of a reciprocable link, a pivoted lever adapted to connect said link and the first lever so that the two move in unison to effect the advance movement of said member, a guard normally moving with said member but retractable relatively thereto upon meeting an obstruction, means, actuable by said guard when so retracted, to swing the second lever out of connecting position and allow the movement of' the link to be completed without moving the first lever, means to reciprocate the link. and a device carried by said means and operable, at the beginning of the advance movement of the mechanism, to hold the second lever in connecting position but retractable therefrom, after said advance movement starts, to allow the second lever to be moved out of connecting position as specified.

8. In safety stops for machinery, the "combination with a reciprocable Vmember the positive operation of which it is desiredvtoA automatically arrest, a pivoted lever, and a link pivotally connected with said member, of Va second link, saidlinksand arm pivotally connected together on a common axis, an

arm on said lever, a reeiprocatory connecting rodto which the second link is pivoted, the

second'linliY in its upward movement adapted to move saidV arm and thereby move said lever to retract, ltliroughgthe iirst link, said member, a lever pivoted onthe second link and adapted, in the downward movement of the latter', to engage said arm and thereby move the first lever to advance, through the iii-st link, said member, a guard moving with said member but retractable relatively thereto iipon meeting an obstruction, and means, actuable by said guard when so retracted, to move the second'lever out of engagement with said arm. Y

9. In safety stops `lor machinery, the combination with a reciprocable member the positive operation of which it is desired to4 automatically arrest, reciprocatoryV driving Y mea1is, a chain of driving elements between the driving means and said member, a guard'v normally moving with said member but retractable relatively thereto uponV meeting an Vobstruction, means, actiiable byV said guard when so "retracted, to disrupt said chain oi' driving elements, a knock-off rod l,arried by said guard, and means operable by said rod,`iipoii the Vactuation of said drive- Vdisrupting means, to positively stop lthe inevement of said member. Y 10; In Ysatety stops lor machinery, the

combination with areeiprocable member the y operable by the knock-off rod, in the retraction of said guard, to engage the ratchet and positively stop the movement of the driving element by which it is'carried and thereby stop the movement of said member.

In testimony of whichinvention we have hereunto set our hands, at Philadelphia, Pa., on this 25th day of July, 1919.

CHARLES FREDERICK IVALZ. FRANCIS DEVELIN MORRIS. 

